1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/gfx/animation/multi_animation.h"
6
7#include "base/logging.h"
8#include "ui/gfx/animation/animation_delegate.h"
9
10namespace gfx {
11
12// Default interval, in ms.
13static const int kDefaultTimerInterval = 20;
14
15static int TotalTime(const MultiAnimation::Parts& parts) {
16  int time_ms = 0;
17  for (size_t i = 0; i < parts.size(); ++i) {
18    DCHECK(parts[i].end_time_ms - parts[i].start_time_ms >= parts[i].time_ms);
19    time_ms += parts[i].time_ms;
20  }
21  return time_ms;
22}
23
24MultiAnimation::MultiAnimation(const Parts& parts,
25                               base::TimeDelta timer_interval)
26    : Animation(timer_interval),
27      parts_(parts),
28      cycle_time_ms_(TotalTime(parts)),
29      current_value_(0),
30      current_part_index_(0),
31      continuous_(true) {
32  DCHECK(!parts_.empty());
33}
34
35MultiAnimation::~MultiAnimation() {}
36
37// static.
38base::TimeDelta MultiAnimation::GetDefaultTimerInterval() {
39  return base::TimeDelta::FromMilliseconds(kDefaultTimerInterval);
40}
41
42double MultiAnimation::GetCurrentValue() const {
43  return current_value_;
44}
45
46void MultiAnimation::Step(base::TimeTicks time_now) {
47  double last_value = current_value_;
48  size_t last_index = current_part_index_;
49
50  int delta = static_cast<int>((time_now - start_time()).InMilliseconds());
51  if (delta >= cycle_time_ms_ && !continuous_) {
52    current_part_index_ = parts_.size() - 1;
53    current_value_ = Tween::CalculateValue(parts_[current_part_index_].type, 1);
54    Stop();
55    return;
56  }
57  delta %= cycle_time_ms_;
58  const Part& part = GetPart(&delta, &current_part_index_);
59  double percent = static_cast<double>(delta + part.start_time_ms) /
60        static_cast<double>(part.end_time_ms);
61  DCHECK(percent <= 1);
62  current_value_ = Tween::CalculateValue(part.type, percent);
63
64  if ((current_value_ != last_value || current_part_index_ != last_index) &&
65      delegate()) {
66    delegate()->AnimationProgressed(this);
67  }
68}
69
70void MultiAnimation::SetStartTime(base::TimeTicks start_time) {
71  Animation::SetStartTime(start_time);
72  current_value_ = 0;
73  current_part_index_ = 0;
74}
75
76const MultiAnimation::Part& MultiAnimation::GetPart(int* time_ms,
77                                                    size_t* part_index) {
78  DCHECK(*time_ms < cycle_time_ms_);
79
80  for (size_t i = 0; i < parts_.size(); ++i) {
81    if (*time_ms < parts_[i].time_ms) {
82      *part_index = i;
83      return parts_[i];
84    }
85
86    *time_ms -= parts_[i].time_ms;
87  }
88  NOTREACHED();
89  *time_ms = 0;
90  *part_index = 0;
91  return parts_[0];
92}
93
94}  // namespace gfx
95